Two friends went to a restaurant and ordered one plain pizza and two sodas . their bill totaled $15.95. later that day, five friends went to the sane restaurant. they ordered three plain pizzas and each person had one soda. their bill totaled $45.90. write and solve a system of equations to determine the price of one plain pizza.

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2